The intestinal problem of Muhammad

(Yes, I didn't enunciate the second I in intestines, so what? sue me and my speech impediment.)

Anyway....

Muhammad apparently flunked anatomy. He believed that an Islamic believer has one intestine while non-believers of Allah (non-Muslims) have 7 intestines. weird right? I know. But the all mighty last prophet of Allah, Muhammad stated so.

"Ib[i]n Umar reported Allah's messenger Mohammad as saying that a non- Muslim eats in seven intestines while a Muslim eats in one intestine."
[Source: The Hadith, (see below) ]

It's not at all shocking that Mohammad believed this due to the time in which he lived in, which in that time the people wasn't quite knowledgeable of the many things we now know of human anatomy of course, but for believers in this day and age to claim the very prophet whom is supposed to be the last messeger of the almighty, the all knowing Allah, claiming this, knowing that this is one of the many things to be completely wrong which was stated by Mohammad and the Qur'an, and still think of him and their book as holy. Then that shows denial in its fullest.
Although, maybe his followers give him some tenuer due to his lack of knowledge, due to the time and place of his upbringing. But again, he is supposedly the holy prophet of Allah, who, is all knowing and instilled Mohammad with incredible knowledge, which in turn makes what he claims about Muslims and non-Muslims to be untrue, causing his deity to be either nonexistant, or just extremly incompetent at his work.